Very useful. I am a beginner and have been tormented by this issue---especially when editing someone else's model with many Scenes. Add a new component, it shows up on every scene. Try to put that component on a new layer, it still shows up on every scene. Fixing each scene is a senseless use of time.
I used Jim Foltz' extension, mentioned above. Works great. Thanks.
From what I've "seen" this is not addressed in any Trimble documentation. Perhaps it should be. One sentence would have saved me at least two hours of head scratching.